import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        for(int i = 0; i < n; i++) {
            a[i] = in.nextInt();
        }
        int ret = Integer.MAX_VALUE;
        Arrays.sort(a);
        for(int i = 1; i < n; i++) {
            int dif = a[i] - a[i-1];
            if(dif < ret) {
                ret = dif;
            }
        }
        System.out.println(ret);
    }
}